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The three leaders said it would be wrong to go ahead with PMQs today with Britain’s future on a knife edge.

They said in a statement: “Our message to the Scottish people will be simple: ‘We want you to stay’.”

Mr Miliband, speaking in Liverpool, added: “I want the ­Scottish people to be in no doubt that the view, I believe from the whole of the UK, is yes, things need to change, but let’s change this together by voting No in the ­referendum.”

And Mr Cameron added: “Let’s be frank, there’s a lot that the political leaders disagree about but there’s one thing that we all agree about passionately and that is our United Kingdom is better off if we stay together.”

In response, Mr Salmond gloated: “The No campaign is in complete and utter disarray, and they are making this farce up as they go along.

“The message of this extraordinary, last minute reaction is the ­Westminster elite are in a state of absolute panic as the ground in Scotland shifts under their feet.”

He added: “Their collective presence in Scotland will be another massive boost for the Yes campaign.”

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Mr Salmond’s team claimed he expected all three to lose their jobs, leaving him to negotiate with a new government about ­Scotland using the pound.

However, Bank of England chief Mark Carney insisted it would not happen and stated: “Currency union is incompatible with sovereignty.”

Sources close to Mr Salmond were also quoted as saying he was “bullish” about reneging on debt.

And the SNP leader risked a row by suggesting the Queen backed ­independence, despite Palace sources insisting she remained neutral.

Mr Salmond said: “I think Her Majesty the Queen, who has seen so many events in the course of her long reign, will be proud to be Queen of Scots as indeed we have been proud to have her as the monarch.”

Defiant: Gordon Brown delivers a speech (Photo: Getty)

Meanwhile, Mr Clegg said giving Scotland more powers if voters rejected independence would lead to further devolution for the rest of the UK.

He told a select committee: “The next Parliament will be of huge constitutional significance, starting of course with this significant transfer of very considerable powers to Holyrood.

“But, I think that will signal a wider debate about how we can rewire and decentralise the British state.”

Former US Secretary of State Henry ­Kissinger warned independence would hit Britain’s nuclear capacity.

The fleet of nuclear-armed Trident submarines are based at Faslane and nationalists have vowed to kick them out if they go it alone.

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Mr Kissinger said: “I’ve been in favour of a nuclear capability for Britain because I wanted it to be recognised as a significant country in terms of global strategy.”

“Anything that makes it smaller, I can’t say I welcome.”

Mr Miliband has urged people across the UK to fly the Saltire and promote the union. Downing Street answered his call yesterday but the first attempt to raise it failed when it appeared to hit a snag halfway up the flagpole.

Workmen eventually unfurled it and will fly above No10 until the ­referendum a week on Thursday.

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Analysis: Labour has the most to lose

By Mirror associate editor Kevin Maguire

David Cameron may lose a country and his premiership but Scotland divorcing Britain would hurt Labour most.

Without Scottish MPs, Labour would have lost two General Elections and been stripped of a majority in a third, while the Conservatives would now rule outright instead of in coalition.

History would take a right turn without Scotland – and Labour’s Harold Wilson and his successor Jim Callaghan might never have been Prime Ministers.

Without Scottish votes:

Instead of Wilson gaining a small majority in 1964, Tory Alec Douglas-Home might have survived in No 10.

In February 1974 Ted Heath could have survived if the Conservatives rather than Wilson’s Labour had been the largest party in a hung Parliament.

Labour wouldn’t have had a majority in October 1974 which two years later enabled Callaghan to follow Wilson.

Ed Miliband’s right to fear it would be much harder to beat the Tories if Scotland abandoned England and Wales.

Last time Labour won 41 Scottish seats and the Conservatives just one.

It’s why a significant number of English Tories want Alex Salmond to wreck Great Britain.